Anthropic's Message Threads Cut Agent Request Size from 800 KB to 1.8 KB

Anthropic's Messages API now caches conversations server side, reducing payload sizes from 800KB to 1.8KB and cutting median time to first token by 35% on long sessions.

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2026-11-02 19:06 · AlphaSignal
Anthropic's Message Threads Cut Agent Request Size from 800 KB to 1.8 KB

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